Sectional incandescent lamp.



G. E. BILL & A. D REDMAN, Sn.

SEGTIONAL INGANDESGENT LAMP. APPLIOATION FILED SEPT. 24, 1908.

Patented Apr. 19, 1910.

with 200% lUNITED STATES PA ENT onn o'n.

\ ononen EDWIN BILL AND/,ALBEERT nnwnnzn Barman, SR, or naanrsnune,

PENNSYLVANIA. I 1

SECTIONAL moannnsonnr LAMP.

Specification othe tters Patent. 1 Patented Apr, 19, 1910.

Atplimtion filed September 24, 1908. Serial No. 454,498.

To whom it may concern: Be it known that we, Gnome EDWIN BiLL and ALBERTDnwnnzn REDMAN, Sn, citizens of the United States, residing at Harrisburin the county of Dauphin, State of Pennsylvania, have invented a new andusefuPSectional Incandescent Lamp, of which the following is aspecification.

This invention relates to sectional incandescent lamps. l

The object of the invention is generally to nnprove the lamp on whichLetters-Patent No. 860,627 were granted to us July 23, 1907 andparticularly the means for successively cutting the filaments intocircuit, one

' at a time, in either order, to the exclusion of there being a ioridgewire extend' the other. filaments.

. Further objects and advantages will ap pear 1n the followingdescription, it being understood that various changes 1n form,proportions'and minor details of construe tlon may be resorted to withinthe scope of the appended claims.

l'n'the accompanying drawingsformi'ng a part of this specification:Figure l-is a slde elevation partly in section of an incandescent lampprovided with a socket controller or regulator constructed ill51000113111162 with our invention.

across the top of the matrix and disposed incontact therewith, as shown.

Arranged within the bulb 5 area plurality of filaments 9 formed ofcarbon or other suitable material and each connected by a platinum leadwire 9' with a conductor 10,

verselyacross .the upper ends of t e filaments and provided with aseries of loo each of which is" connected with one of tii:

I Fig- 2 is a transverse sec-* tional view taken on the line 2--2 ofFig. 1.

.of reference indicate I said gear.

transstrands of each filamentr These conductors with the plate 8, theends of the con uctors 10 being extended into the eyelets andsoldered orotherwise secured to the interior walls thereof.

Disposed in spaced relation to the plate 8 is a mating ca 13 having a semental slot or groove. 15 w ich is engaged y a radial projection 14 onthe cap 6, whereby said caps are locked against accidental separation. r

The cap -l3 is formed with terminal threads 16 adapted to engage thecorrespondin threads 17 of an ordinary incan descent amp socket,indicated at 18, so that the device may be conveniently connected in alighting circuit, one terminal of the circuit being connected to the cap13 and the opposite terminal thereof'to a metallic rod or pin 19 carriedby said cap.

The lower end of the pin 19 terminates short of the plate 8 andisprovided with a threaded socket20 for engagement with a correspondinglythreaded pin or screw 21, there being a worm wheel or gear 22 interposedbetween the base of thepin 19 and the head 23 of/the screw, as shown.

' The gear 22 is free to revolve on the screw the base of the pin 19 andthe head 23 being devoid of threads/to Secured to and mounted forrotation with the gear 22 is a contact member 24 preferably formed of asingle strip of spring metal, one end of which is fastened to the gear,while the opposite end thereof 15 bent 21, that portion of the screwbetween permit free rotation'of upon itself and thence extendedlaterally to form a spring tongue 25 terminating in an upwardly curvedlip 26;

That portion of the sprlng tongue 25 adjacentthe lip 26 is provided witha depression defining a projection 27 arranged to enter the sockets ofthe contacts or eyelets 11, thereby to temporarlly lock the springtongue in engagement with said contacts.

Journaled in insulated bearings 27 in the walls of the caps 6 and 18 isa transverse rod 28 having its intermediate portion provided with a wormgear 29 adapted to mesh with-the gear 22, there being a finger piececuit the candle power of the lamy may be varied at will.

.Vhen it is desired to vary the intensity of the light the rod 28 isrotated by turning the finger piece 30 thus causing the worm 29 toengage the teeth of the gear 22 and rotate the contact member 24:.

As the spring tongue of the contact member travels over the uppersurface of the plate 8, the projection 27 of said tongue will enter thesocket of the adjacent eyelet or contact 11, thusclosing the circuitthrough the first filament of the series or bank and causing the same tobecome incandescent.

When the contact 24: is in the position shown in Fig. 1 of the drawingsthe current will flow through the contact 24 to the adjacentstationarycontact or eyelet and thence through the loop or filament connected withsaid stationary contact and off to the line through the cap 6. When themovable contact 24 is again rotated the spring tongue of said contactwill engage the next succeeding stationary contact, in which event thecurrent will fiow through the second loop or filament and thence throughthe bridge wire or common return 31 to the cap 6 and then off to theline. It will thus be seen that the several filaments may besuccessively cut into circuit, one at a time,in either order, to theexclusion of the other filaments, each filament having a differentcandle power and therefore permitting variation in the intensity of thelight.

Attention is here called to the fact that the lug or projection 27 onthe spring tongue of the movable contact will enter the sockets of thestationary contacts as the tongue'successively registers therewith so asto temporarilylock the movable contact in circuit closing position, itof course being understood that the projection is held in engagementwith the sockets only by the spring action of the tongue so that arelatively quick turning movement exerted on the finger piecet3O willdisengage the projection 27 from the socket of the adjacent stationarycontact and thus permit the movable contact 24: to be positionedover'the next succeeding stationary cpntact when a furpin 19 and movable,ther rotary movement is imparted to said finger piece. The resiliencyof the movable contact will cause it to engage the stationary contactwith a light, sharp, clicking sound, so that should there be adefectivev connection to one of the conducting wires, the engagement ofthe movable and stationary contacts will be announced by the usualclicking sound, but will not be followed by the flashing of thecorresponding filament. The presence of a defect will thus be madeknown, when it would not be discovered if g the only notice given of theengagement of the contact was the lighting up of the filament. It willalso be noted that the bridge Wire or common return 31 is formed of aplurality of loops each of which is connected with one of the strands ofeach filament so that when one filament of the'bank is cut intocircuitthe remaining filaments of the series or-bank will be cut out,the current following thepath of the least resistance and passingthrough the bridge wire or common return to the cap 6 and. thence oil tothe line in the manner before stated.

The lamps may be made in different sizes and shapes and provided withany number of filaments. It will also be understood that the filamentsand lead wires may be formed 'of carbon, platinum or other suitablematerial without departing from the spirit of the invention.

Having thus described the invention what is claimed is 1. In anincandescent lamp having a plurality of filaments, the'combination of aplate extending horizontally across the lamp above the filaments,stationary tubular contacts piercing the said plate, connecting wiresleading from the filaments and having their ends secured within thebores of the tubular contacts, a conducting pin' within the upperportion of the lamp, a resilient contact mounted on the lower end of theand provided with an enlargedhead, said screw havin an intermediateortion thereof devoid 0 threads, a gear w eel mounted for rotation onthe unthreaded portion of the screw, and a movable contact carried bythe gear to engage the stationary contact.

, 3. In .a lamp of the character set forth, the combination of apluralitypf stationary tubular contacts, an operating shaft disposedhorizontally above said contacts, a as our own, we have hereto aflixedour'siggear driven by said shaft, and a contact natures m the presenceof two witnesses. member having one end secured to said I gear,extending radially therefrom and gggig g fi s 7 then bent back on itselfto present a free B R spring arm having a projection on its underWitnesses:

- side to enter one of the tubularcontaots. C. H. BACK-ENSTOE,

In testimony that we claim the foregoing ED IN M. HERSEEY.

